JPH0123765B2 - - Google Patents
Info
- Publication number
- JPH0123765B2 JPH0123765B2 JP56153967A JP15396781A JPH0123765B2 JP H0123765 B2 JPH0123765 B2 JP H0123765B2 JP 56153967 A JP56153967 A JP 56153967A JP 15396781 A JP15396781 A JP 15396781A JP H0123765 B2 JPH0123765 B2 JP H0123765B2
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- optical
- interferometer
- abry
- modulation device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 claims description 22
- 239000000835 fiber Substances 0.000 claims description 9
- 239000013307 optical fiber Substances 0.000 claims description 6
- 238000005253 cladding Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000005355 lead glass Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0147—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on thermo-optic effects
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Measuring Magnetic Variables (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Light Guides In General And Applications Therefor (AREA)
Description
【発明の詳細な説明】
本発明は、電磁界情報を光に変調された光情報
とするための光変調装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical modulation device for converting electromagnetic field information into optical information modulated into light.
従来この種の光変調装置は電圧変調素子（Li
NbO3、LiTaO3、水晶）等や電流変調素子（鉛ガ
ラス等）がある。この装置の欠点は結晶面、偏光
素子、検光素子等が分離しているため、振動、温
度等の環境変化が光路に影響するため本質的に測
定誤差の原因を有し、また各装置が独立している
ため大型化し、かつ調整が困難であつた。 Conventionally, this type of optical modulation device uses a voltage modulation element (L i
N b O 3 , L i T a O 3 , crystal), and current modulation elements (lead glass, etc.). The disadvantage of this device is that the crystal plane, polarizing element, analyzer, etc. are separated, so environmental changes such as vibration and temperature affect the optical path, which inherently causes measurement errors. Because they are independent, they are large and difficult to adjust.
一方、半導体ダイオードで電流を変調した後光
ダイオードに印加するようにした光変調装置もあ
るが、特に多段変調を行う場合には複離な電気回
路を組込む必要があり、また電気的に接続される
ので外部からと相互間の干渉が生じ易い欠点があ
つた。 On the other hand, there is an optical modulation device that modulates the current with a semiconductor diode and then applies it to the photodiode, but especially when performing multi-stage modulation, it is necessary to incorporate a separate electrical circuit, and it is necessary to incorporate electrical circuits. Therefore, there was a drawback that interference from the outside and each other was likely to occur.
本発明の目的は、外部からも相互間にも干渉が
生ずることがなく小型に形成することができる光
変調装置を提供することにある。 An object of the present invention is to provide an optical modulation device that can be formed compactly without causing interference either from the outside or between the devices.
本発明の実施例を図面を参照してのべると、第
１図は本発明に係る光変調装置１０を示し、この
光変調装置は、所定長さのシングルモード又は複
数モードの光フアイバ１２とその両端面に形成さ
れた反射膜１４，１４′とから成るフアイバフア
ブリペロー干渉計１６とこのフアイバフアブリペ
ロー干渉計に接触してその光学的長さに変化を与
える１つ又は複数の補助加振器１８，１８′とを
備えている。 Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a light modulation device 10 according to the present invention, which includes a single-mode or multi-mode optical fiber 12 of a predetermined length, A fiber Abry-Perot interferometer 16 consisting of reflective films 14 and 14' formed on both end faces, and one or more auxiliary additives that contact the fiber Abry-Perot interferometer and change its optical length. It is equipped with shakers 18, 18'.
干渉計１６の光フアイバ１２は、第２図に示す
ように、コア１２ａとクラツド１２ｂと緩衝層１
２ｃとナイロン被覆１２ｄとから成つている。反
射膜１４，１４′はSiO2とTiO2とを交互に蒸着等
によつて付着した誘電体多層膜であるのが好まし
い。これらの反射膜は光フアイバ１２のコア１２
ａとクラツド１２ｂとの端面に施される。 As shown in FIG. 2, the optical fiber 12 of the interferometer 16 includes a core 12a, a cladding 12b, and a buffer layer 1.
2c and a nylon coating 12d. The reflective films 14, 14' are preferably dielectric multilayer films in which S i O 2 and T i O 2 are alternately deposited by vapor deposition or the like. These reflective films cover the core 12 of the optical fiber 12.
It is applied to the end faces of a and cladding 12b.
補助加振器１８，１８′は、磁歪素子又は電歪
素子が用いられる。磁歪素子はフエライトにコイ
ルが巻付けられてこのコイルに流れる電流の変化
によつてフエライトが振動する磁気歪み振動子で
あり、また電歪素子は例えば圧電素子の電極間に
印加される電圧の変化によつて圧電素子が振動す
る振動子である。これらの補助加振器１８，１
８′は干渉計１６の表面に所定の長さ部分にわた
つて接触するように適宜の手段で接着される。 A magnetostrictive element or an electrostrictive element is used for the auxiliary vibrator 18, 18'. A magnetostrictive element is a magnetostrictive vibrator in which a coil is wound around a ferrite, and the ferrite vibrates due to changes in the current flowing through the coil.An electrostrictive element is a magnetostrictive oscillator that vibrates due to changes in the current flowing through the coil.An electrostrictive element, for example, uses changes in the voltage applied between the electrodes of a piezoelectric element. This is a vibrator in which a piezoelectric element vibrates. These auxiliary exciters 18,1
8' is bonded to the surface of the interferometer 16 by appropriate means so as to be in contact with the surface of the interferometer 16 over a predetermined length.
半導体レーザの如き光源２０がこの干渉計１６
の一方の端面に設けられて干渉計１６に光を入射
しフオトマルチプライヤ、ピンフオトダイオード
の如き光信号を検出する光検出器２２が干渉計１
６の他方の端面に設けられて干渉計１６からの光
信号を検出する。 A light source 20 such as a semiconductor laser is connected to the interferometer 16.
A photodetector 22 is provided on one end face of the interferometer 1 and detects an optical signal such as a photomultiplier or a pin photodiode by inputting light into the interferometer 16.
The interferometer 6 detects the optical signal from the interferometer 16 .
次に、上記装置の動作をのべると、光源２０か
ら光がフアイバフアブリペロー干渉計１６に入射
されるが、この光は干渉計１６内で補助加振器１
８，１８′による振動で干渉計１６が光学的長さ
の変化を受けるため変調される。従つて、光検出
器２２には補助加振器１８，１８′に供給される
電圧又は電流の変化に応じて変調された光が検出
される。 Next, to describe the operation of the above device, light from the light source 20 is incident on the fiber Abry-Perot interferometer 16.
The vibrations caused by 8 and 18' modulate the interferometer 16 as it undergoes a change in optical length. Therefore, the photodetector 22 detects light that is modulated in accordance with changes in the voltage or current supplied to the auxiliary exciters 18, 18'.
本発明の具体例として磁界計測に応用した場合
をのべると、端面反射率70％の反射膜を設けた長
さ10ｍのシングモードフアイバから成るフアブリ
ペロー干渉計を用意し、また外径55mm、長さ80mm
の磁歪振動子を用意し、フアブリペロー干渉計を
この磁歪振動子に巻付けて干渉計にHe−Neレー
ザ（λ＝0.633μｍ）を入射した。磁歪振動子に
50HzのAC磁界（第３図Ａ）を印加したところ光
検出器に検出された光信号は第３図Ｂに示すよう
な波形を有していた。この光信号の周波数は磁界
の振幅と共に変化し、従つて光信号をパルス信号
に変換し、このパルス信号を計数することによつ
て磁界を測定することができる。尚、磁歪振動子
の代りに電歪振動子を用いることによつて電圧の
振幅を光学的に測定することができる。また、第
１図に示すように、複数の補助加振器を用いる
と、光信号を多段変調することができることはも
ちろんである。 As a specific example of the present invention applied to magnetic field measurement, a Fabry-Perot interferometer consisting of a 10 m long single mode fiber with a reflective film with an end face reflectance of 70% is prepared, and the outer diameter is 55 mm and the length is 55 mm. 80mm
A magnetostrictive vibrator was prepared, a Fabry-Perot interferometer was wound around the magnetostrictive vibrator, and a H e -N e laser (λ = 0.633 μm) was incident on the interferometer. For magnetostrictive vibrator
When a 50 Hz AC magnetic field (FIG. 3A) was applied, the optical signal detected by the photodetector had a waveform as shown in FIG. 3B. The frequency of this optical signal changes with the amplitude of the magnetic field, so the magnetic field can be measured by converting the optical signal into pulse signals and counting the pulse signals. Note that by using an electrostrictive vibrator instead of the magnetostrictive vibrator, the amplitude of the voltage can be measured optically. Furthermore, as shown in FIG. 1, by using a plurality of auxiliary exciters, the optical signal can of course be modulated in multiple stages.
本発明によれば、上記のように、光信号を磁
界、電圧等によつて変調するので外部からの雑音
を受けることなく高精度、高感度で変調された光
信号を検出することができ、また従来のように各
装置が独立していないので全体的に小型化するこ
とができ、更にフアイバフアブリペロー干渉計か
ら加振器へのフイードバツクがないのでイソレー
タとしての機能を有し、多段変調をする場合でも
その相互間が干渉し合うことがなく復調を精度よ
く行うことができる。 According to the present invention, as described above, since the optical signal is modulated by a magnetic field, voltage, etc., the modulated optical signal can be detected with high precision and high sensitivity without being affected by external noise. In addition, since each device is not independent as in the past, the overall size can be reduced, and since there is no feedback from the fiber Abry-Perot interferometer to the exciter, it functions as an isolator and can be used for multi-stage modulation. Even when the signals are used, demodulation can be performed with high accuracy without interference between them.
第１図は本発明に係る光変調装置の概略系統
図、第２図は光フアイバの拡大横断面図、第３図
は本発明の光変調装置を用いてAC磁界で変調さ
れた光信号を示す波形図である。
１０……光変調装置、１２……光フアイバ、１
４，１４′……反射膜、１６……フアイバフアブ
リペロー干渉計、１８，１８′……補助加振器。
Fig. 1 is a schematic system diagram of an optical modulation device according to the present invention, Fig. 2 is an enlarged cross-sectional view of an optical fiber, and Fig. 3 is an optical signal modulated by an A C magnetic field using the optical modulation device of the present invention. FIG. 10...Light modulation device, 12...Optical fiber, 1
4, 14'... Reflection film, 16... Fiber Abry-Perot interferometer, 18, 18'... Auxiliary exciter.
Claims (1)
アイバフアブリペロー干渉計と前記フアイバフア
ブリペロー干渉計に接触する補助加振器とから成
つていることを特徴とする光変調装置。 ２ 前記補助加振器は電歪素子である特許請求の
範囲第１項に記載の光変調装置。 ３ 前記補助加振器は磁歪素子である特許請求の
範囲第１項に記載の光変調装置。 ４ 複数の補助加振器が前記フアイバフアブリペ
ロー干渉計に接触して多段変調するようにした特
許請求の範囲第１項乃至第３項のいずれかに記載
の光変調装置。[Scope of Claims] 1. A fiber Abry-Perot interferometer having reflective films formed on both end faces of an optical fiber, and an auxiliary exciter in contact with the fiber Abry-Perot interferometer. Light modulator. 2. The optical modulation device according to claim 1, wherein the auxiliary exciter is an electrostrictive element. 3. The optical modulation device according to claim 1, wherein the auxiliary exciter is a magnetostrictive element. 4. The optical modulation device according to any one of claims 1 to 3, wherein a plurality of auxiliary exciters contact the fiber Abry-Perot interferometer to perform multi-stage modulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56153967A JPS5855911A (en) | 1981-09-30 | 1981-09-30 | Optical modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56153967A JPS5855911A (en) | 1981-09-30 | 1981-09-30 | Optical modulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5855911A JPS5855911A (en) | 1983-04-02 |
| JPH0123765B2 true JPH0123765B2 (en) | 1989-05-08 |
Family
ID=15573979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56153967A Granted JPS5855911A (en) | 1981-09-30 | 1981-09-30 | Optical modulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5855911A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0738488B2 (en) * | 1985-07-24 | 1995-04-26 | ブリティシュ・テレコミュニケ−ションズ・パブリック・リミテッド・カンパニ | Dielectric optical waveguide device, optical fiber amplifier, optical signal wavelength selection method, and dielectric optical waveguide device manufacturing method |
| JPH0786591B2 (en) * | 1988-07-04 | 1995-09-20 | 日本電信電話株式会社 | Optical fiber type Fabry-Perot resonator |
-
1981
- 1981-09-30 JP JP56153967A patent/JPS5855911A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5855911A (en) | 1983-04-02 |
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